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研究了在ＴｒｉｔｏｎＸ—１００存在下，新星色剂苯并噻吐重氮氨基偶氮苯（ＢＴＤＡＢ）与铜（Ⅱ）的显色反应，结果表明，在 ｐＨ１０．５～ １１．７碱性介质中，铜（Ⅱ）与试剂形成１：２的橙红色络合物，其最大吸收波长为 ５３０ｎｍ，表观摩尔吸光系数ε＝１．４７ Ｘ １０~５，铜（Ⅱ）量在０～１４μｇ／２５ｍＬ范围内符合比尔定律．用于铝合金中铜含量的测定，结果令人满意．
The color reaction of benzotriazole diazoaminoazobenzene (BTDAB) with copper (Ⅱ) in the presence of TritonX-100 was studied. The results showed that at pH 10.5 ~ 11.7, , Copper (Ⅱ) forms a 1: 2 orange-red complex with the reagent, its maximum absorption wavelength is 530nm, apparent molar absorptivity ε = 1.47 × 10-5, copper (Ⅱ) Beer’s law is within the 25mL range. For the determination of copper content in aluminum alloy, the results are satisfactory.